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C++ Exercises: Asked user to input positive integers to process count, maximum, minimum, and average

C++ For Loop: Exercise-15 with Solution

Write a program in C++ to asked user to input positive integers to process count, maximum, minimum, and average or terminate the process with -1.

Pictorial Presentation:

C++ Exercises: Asked user to input positive integers to process count, maximum, minimum, and average or terminate the process with -1

Sample Solution :-

C++ Code :

#include <iostream>
#include <climits>
#include <iomanip>
using namespace std;

int main()
{
    int posnum, ctr, sum, max = 0;
    int min = INT_MAX;
    int terval = -1;
    cout << "\n\n Input a positive integers to calculate some processes or -1 to terminate:\n";
    cout << "----------------------------------------------------------------------------\n";
    cout << " Input positive integer or " << terval << " to terminate: ";
    while (cin >> posnum && posnum != terval) 
    {
        if (posnum > 0) 
        {
            ++ctr;
            sum += posnum;
            if (max < posnum)
                max = posnum;
            if (min > posnum)
                min = posnum;
        }
        else 
        {
            cout << "error: input must be positive! if negative, the value will only be -1! try again..." << endl;
        }
        cout << " Input positive integer or " << terval << " to terminate: ";
    }
    cout << "\n Your input is for termination. Here is the result below: " << endl;
    cout << " Number of positive integers is: " << ctr << endl;
    if (ctr > 0) 
	{
        cout << " The maximum value is: " << max << endl;
        cout << " The minimum value is: " << min << endl;
        cout << fixed << setprecision(2);
        cout << " The average is " << (double)sum / ctr << endl;
    }
}

Sample Output:

 Input a positive integers to calculate some processes or -1 to terminate:                                                                      
----------------------------------------------------------------------------                                                                  
 Input positive integer or -1 to terminate: 25                         
 Input positive integer or -1 to terminate: 15                         
 Input positive integer or -1 to terminate: 35                         
 Input positive integer or -1 to terminate: -1                         
                                                                       
 Your input is for termination. Here is the result below:              
 Number of positive integers is: 3                                     
 The maximum value is: 35                                              
 The minimum value is: 15                                              
 The average is 25.00

Flowchart:

Flowchart: Asked user to input positive integers to process count, maximum, minimum, and average

C++ Code Editor:

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Previous: Write a program in C++ to find the sum of series 1 - X^2/2! + X^4/4!-.... upto nth term.
Next: Write a program in C++ to list non-prime numbers from 1 to an upperbound.

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C++ Programming: Tips of the Day

What is a smart pointer and when should I use one?

This answer is rather old, and so describes what was 'good' at the time, which was smart pointers provided by the Boost library. Since C++11, the standard library has provided sufficient smart pointers types, and so you should favour the use of std::unique_ptr, std::shared_ptr and std::weak_ptr.

There was also std::auto_ptr. It was very much like a scoped pointer, except that it also had the "special" dangerous ability to be copied - which also unexpectedly transfers ownership.

It was deprecated in C++11 and removed in C++17, so you shouldn't use it.

std::auto_ptr<MyObject> p1 (new MyObject());
std::auto_ptr<MyObject> p2 = p1; // Copy and transfer ownership. 
                                 // p1 gets set to empty!
p2->DoSomething(); // Works.
p1->DoSomething(); // Oh oh. Hopefully raises some NULL pointer exception.

Ref : https://bit.ly/3mc9GHE